1. Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Baltimore City Health Department, Baltimore, Maryland, USA
3. New York City Department of Health, New York City, New York, USA
4. Public Health Research Institute, New York City, New York, USA
5. Maryland State Department of Health and Mental Hygiene, Baltimore, Maryland, USA
6. Centers for Disease Control and Prevention, Atlanta, Georgia, USABaltimore City Health Department, Baltimore, Maryland, USA
7. New Jersey Department of Health and Senior Services, Trenton, New Jersey, USA